WiteWulf

No progress as no money this month 😂 I promise I’ll come back with an update after I get paid and get some work done! FWIW, though, I posted the same query on a number of VAG owners forums, and the same diagnosis came back every time: dodgy N280 regulator valve. It’s a cheap enough part, but the drain and re-gas means I can’t do it myself, annoyingly.

Will do

Thanks @cliffcoggin, time to look for a local HVAC specialist, then

Thanks for the great write-up @Stewb My A6 is blowing warm air at the moment, but sadly replacing this sensor didn't sort it. I've posted about it here if anyone reading this can offer advice.

Afternoon all, I'd like some advice re. getting my aircon working if possible, please. I have a 2014 A6 C7 Avant Ultra with 4 zone climate feature. Bought it late last year when it was cold and the heater works perfectly (although, thinking back, I did notice that the windscreen was hard to defog). Now the UK temperatures have started heading upwards I find that the A/C doesn't cool. It's only ~20degC out there at the moment, but dialling the AC down to 16degC gets the fans spinning like mad, but pushing air at ambient temperature. I've checked, and it's the same at all vents, not just the drivers. After reading this thread I fitted a Mahle replacement pressure sensor, hoping it would be a quick and cheap fix, but it's made no difference A VCDS scan show no errors with the HVAC systems. See the attached screengrab for figures from when the engine had been running (stationary) for about 30mins with the AC dialled down to 16degC. The compressor is running, refrigerant is at ~6bar and the vents are expecting -13degC but getting +31degC. Refrigerant was at ~3bar with the system not running. Any bright ideas, people?

Hi @Entwood, it's not possible to upgrade the GSM modules, and with all carriers now having pretty much disabled 3G services in the UK it's useless, I'm afraid. (I'm not a car expert, but I do work in telecoms 🙂)